CN109138856B - coiled tubing connector - Google Patents
coiled tubing connector Download PDFInfo
- Publication number
- CN109138856B CN109138856B CN201811396304.9A CN201811396304A CN109138856B CN 109138856 B CN109138856 B CN 109138856B CN 201811396304 A CN201811396304 A CN 201811396304A CN 109138856 B CN109138856 B CN 109138856B
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- locking sleeve
- coiled tubing
- upper locking
- assembly
- slips
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- 210000001503 joint Anatomy 0.000 claims abstract description 57
- 238000007789 sealing Methods 0.000 claims description 59
- 238000005520 cutting process Methods 0.000 claims description 15
- 238000009434 installation Methods 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/10—Slips; Spiders ; Catching devices
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The invention belongs to the field of oil and gas field development, and particularly relates to a continuous oil pipe connector, which comprises an upper continuous oil pipe locking sleeve assembly, a middle joint assembly and a lower continuous oil pipe locking sleeve assembly; the end surfaces of the left end and the right end of the middle joint assembly are abutted against the inner walls of the upper locking sleeve assembly and the lower locking sleeve assembly of the continuous oil pipe, and are connected with the middle joint assembly through threads. The coiled tubing connector provided by the invention can solve the problem that when the coiled tubing or the roller coiled tubing on two barrels is connected with the underground coiled tubing, the coiled tubing cannot be rotated to be buckled and unbuckled due to relative rotation, and meanwhile, the coiled tubing upper locking sleeve assembly and the coiled tubing lower locking sleeve assembly are connected through threads after being buckled, so that the torque transferring function is realized, the practicability is good, and the installation is convenient.
Description
Technical Field
The invention belongs to the technical field of oil and gas well engineering equipment, and particularly relates to a continuous oil pipe connector which is used for connecting a continuous oil pipe and a continuous oil pipe in a buckling manner, especially for underground operations such as deep well drilling, ultra-deep well continuous oil pipe drilling and the like needing to transmit large axial tension and circumferential torque, and the like, wherein the length of the continuous oil pipe on a single roller cannot be too long due to the limitation of highway transportation height, and when the deep well continuous oil pipe and the ultra-deep well continuous oil pipe are operated, a plurality of roller continuous oil pipes are required to be connected, so that the transmission of the large tension and the large torque between the continuous oil pipe and the continuous oil pipe is realized; meanwhile, as the coiled tubing winds and bends on the roller, the fluid flowing through the water hole in the coiled tubing is easy to form secondary vortex, so that the circulating pressure consumption of the fluid in the water hole in the coiled tubing on the roller is greatly increased, and from the angle of reducing the circulating pressure consumption of the roller, a single long coiled tubing of the roller is required to be replaced by a plurality of short coiled tubing of the roller for underground operation, thereby achieving the purpose of effectively reducing the circulating pressure consumption of the roller on the ground; in addition, coiled tubing on the drum (or downhole) cannot rotate, and the connection between coiled tubing and coiled tubing usually requires a rotating button to make the connection, so special connectors are required to meet the requirements; the connector adopts external slip locking and spring pressing, and adopts a sliding sleeve mechanism to realize buckling connection, so that various underground operations such as drilling, completion, logging, workover and the like of a deep well and an ultra-deep well can be completed by the continuous oil pipe.
Background
Because coiled tubing is very versatile: the device can be used for cleaning pipelines, flushing sand plugs, paraffin removal, selective acidification, gas lift production, squeezing cement plugs, well killing, negative pressure perforation, well testing, displacement drilling fluid, high-inclination well logging, horizontal well logging, well completion, salvage, tripping setting expansion type dividers, drilling plugs, grinding fish, permanent installation as production pipes, bottom hole photographing, small experience drilling, secondary drilling and deepening drilling, casing windowing sidetracking, oil pipe patching and the like, and can be used for horizontal well drilling, cased well drilling, open hole drilling, deepening drilling, small well drilling, micro well drilling, old well windowing sidetracking, underbalanced well drilling, well repairing, well completion and the like; the coiled tubing drilling has the characteristics of low cost, low energy consumption, safety, environmental protection, wide application range and the like, can improve the development benefits of difficult-to-use oil and gas reservoirs such as 'low pressure, low permeability, low yield' three low-oil and gas reservoirs and the like in old oil fields, and particularly has wide application prospects in the aspects of exploration and development of unconventional gas reservoirs, dense gas, shale gas, coalbed gas and the like in China.
However, the downhole operation technology of the continuous oil pipe has the problem to be solved urgently:
the diameter of the coiled tubing used for operation is smaller, the water hole in the coiled tubing is smaller, most of the coiled tubing is coiled on the roller, the circulating pressure consumption of the water hole in the coiled tubing is larger in the operation process, especially on the roller, due to the influence of secondary vortex, the circulating pressure consumption is larger, most of the circulating pressure consumption is consumed on the coiled tubing roller, the distribution of the water power of the coiled tubing underground operation is seriously influenced, the longer coiled tubing of a single roller is divided into a plurality of coiled tubing with short rollers, the coiled tubing is connected before being sequentially put into the well, the length of the coiled tubing which is not put into the well on the roller is reduced, and the water power consumed by the coiled tubing on the ground is reduced, so that a special connector between the coiled tubing and the coiled tubing is needed.
Meanwhile, due to the limitation of highway transportation, the continuous oil pipe on a single roller cannot be too long, the long continuous oil pipe required by a deep well and an ultra-deep well is divided into a plurality of rollers to be transported to a well site, and the continuous oil pipe of one roller is connected with the continuous oil pipe of another roller after the continuous oil pipe of the roller is put down in the well, so that the aim of completing underground operation by using the long continuous oil pipe can be fulfilled, and a special connector between the continuous oil pipe and the continuous oil pipe is also required.
In addition, for coiled tubing deep well, ultra deep well or drilling coiled tubing downhole operation, the coiled tubing is larger in axial tension transmission and larger in axial reactive torque, and special coiled tubing connectors are needed to meet the requirements.
The coiled tubing connector is also called a coiled tubing joint, a locker (or mechanism, device), a connector (or mechanism, device), a grasper (or mechanism, device), a clincher (or mechanism, device) or the like, and is a connecting tool for quickly connecting the coiled tubing with the coiled tubing or a downhole tool at the surface.
The slip type coiled tubing connector is generally connected in a way of clamping a single face by adding a conical slip on the outer wall of the coiled tubing or adding an expansion slip on the inner wall of the coiled tubing, is also limited by stress deformation of the coiled tubing, has smaller torque and tensile stress transmitted after connection, is only suitable for connection of the coiled tubing with a downhole tool in logging, gas lifting and other operations with low downhole string acting force, and simultaneously, most of slip type connectors need to be tightly buckled around an axial direction in the connection process to realize slip clamping connection.
The tension and torque of the continuous oil pipe connection are increased in a mode of simultaneously pressurizing from inside and outside of the continuous oil pipe on site, and meanwhile, in the connection process, the connection of the continuous oil pipe with large torque and axial tension of the inside and outside pressurization is realized mostly through rotating the fastening cone slips. At present, no continuous oil pipe connector which is used for providing rotary connection for a continuous oil pipe connector and is used for deep wells, ultra-deep wells or drilling and has large axial tension and large circumferential torque is available in the market.
Disclosure of Invention
In view of the above problems, it is an object of the present invention to provide a coiled tubing connector that enables multi-roller coiled tubing section-to-section connection for deep, ultra-deep or well drilling processes.
In order to achieve the above purpose, the technical scheme is as follows:
the invention provides a coiled tubing connector, comprising: the structure of the coiled tubing upper locking sleeve assembly is axially symmetrical with the structure of the coiled tubing lower locking sleeve assembly, and the coiled tubing upper locking sleeve assembly and the coiled tubing lower locking sleeve assembly are in threaded connection with two ends of the middle joint assembly;
the coiled tubing upper locking sleeve assembly comprises an upper coiled tubing, an upper locking sleeve sealing joint, an upper locking sleeve shell, an upper locking sleeve external fixed conical slip, an upper sliding conical slip in the upper locking sleeve, an upper locking sleeve pre-tightening spring and an upper locking sleeve coiled tubing anti-slip; the upper coiled tubing comprises an upper coiled tubing body and an upper coiled tubing cutting body which are of an integral structure, wherein the right end of the upper coiled tubing cutting body is outwards turned and then is bent up, a sealing joint of an upper locking sleeve is sleeved on the upper coiled tubing body, two ends of a housing of the upper locking sleeve are respectively connected with the sealing joint of the upper locking sleeve and an intermediate joint assembly in a threaded manner, the sealing joint of the upper locking sleeve, the housing of the upper locking sleeve, the intermediate joint assembly and the upper coiled tubing enclose a cavity, an outer fixed conical slip of the upper locking sleeve, an inner sliding conical slip of the upper locking sleeve, an upper locking sleeve pre-tightening spring and an upper locking sleeve coiled tubing anti-slip are respectively positioned in the cavity, the right end of the inner sliding conical slip of the upper locking sleeve is slid into a gap formed by the upper coiled tubing cutting body, the outer fixed conical slip of the upper locking sleeve is sleeved on the inner sliding conical slip of the upper locking sleeve, and the two ends of the upper locking sleeve pre-tightening spring are respectively propped against the outer side of the upper locking sleeve anti-slip conical slip and the upper sliding conical slip anti-slip of the upper locking sleeve after being bent up coiled; the middle joint assembly comprises a middle joint core part sealing threaded connector and a middle joint shell rotating connector, the middle joint core part sealing threaded connector is positioned on the inner side of the middle joint shell rotating connector and is in threaded connection with the middle joint core part sealing threaded connector, one end of the middle joint shell rotating connector is sleeved into the upper continuous oil pipe in a sliding mode, and the middle joint shell rotating connector is coaxial with the upper continuous oil pipe.
The upper locking sleeve sealing joint is of a cylindrical structure, one end, far away from the middle joint assembly, of the outer wall of the upper locking sleeve sealing joint is a conical surface, one end, close to the middle joint assembly, of the upper locking sleeve sealing joint is axially provided with a first step, a second step and a third step, the outer diameter of the first step is the maximum outer diameter of the upper locking sleeve sealing joint, the second step is provided with external threads, the third step is provided with three annular sealing grooves for installing O-shaped rings, and the inner wall of the upper locking sleeve sealing joint is provided with six annular sealing grooves for installing O-shaped rings.
The upper locking sleeve shell body is of a cylindrical structure, the outer diameter of the upper locking sleeve shell body is the same as the maximum outer diameter of an upper locking sleeve sealing joint, a first step, a second step and a third step are sequentially machined on the inner wall of the upper locking sleeve shell body along the axial direction, the inner diameter of the second step is smaller than that of the first step and the third step, an inner thread matched with an outer thread on the second step of the upper locking sleeve sealing joint is machined on the first step of the upper locking sleeve shell body, and an inner thread is machined on the third step of the upper locking sleeve shell body.
A first step, a second step, a third step, a fourth step and a fifth step are sequentially machined on the outer wall of the rotary joint of the middle joint shell along the axial direction, and the outer diameter of the first step is the same as the inner diameter of the upper continuous oil pipe; the outer diameter of the second-stage step is larger than that of the first-stage step, and an external thread matched with an internal thread on the third-stage step of the upper locking sleeve shell body is machined on the second-stage step; the outer diameter of the third-stage step is larger than that of the second-stage step, and is the maximum outer diameter of the continuous oil pipe connector; the outer diameter of the four-stage step is the same as that of the two-stage step, and external threads are machined on the four-stage step; the outer diameter of the five-stage step is the same as that of the one-stage step.
The outer fixed cone slips of the upper locking sleeve are of cylindrical structures, the outer diameter of the outer fixed cone slips of the upper locking sleeve is identical to the inner diameter of the second-stage step of the outer shell of the upper locking sleeve, the inner wall of the outer fixed cone slips of the upper locking sleeve is a conical surface with the inner diameter gradually increasing towards the middle joint assembly, and one end, far away from the middle joint assembly, of the conical surface abuts against the end face of the third-stage step of the sealing joint of the upper locking sleeve.
The inner diameter of the inner sliding cone-shaped slip in the upper locking sleeve is the same as the outer diameter of the upper continuous oil pipe, saw teeth which are uniformly distributed towards the direction of the middle joint assembly are processed on the inner wall of the inner sliding cone-shaped slip in the upper locking sleeve, one step, two steps and three steps are sequentially processed on the outer wall of the inner sliding cone-shaped slip in the upper locking sleeve towards the direction of the middle joint assembly, and the outer wall of the one step is a conical surface with the outer diameter gradually increasing towards the direction of the middle joint assembly; the outer wall of the second-stage step is a cylindrical surface, and a locking sleeve pre-tightening spring is arranged on the second-stage step; the outer diameter of the three-stage step gradually increases gradually towards the direction of the middle joint assembly.
The upper locking sleeve coiled tubing anti-slip is characterized in that the upper locking sleeve coiled tubing anti-slip is two semicircular rings, the outer walls of the two semicircular rings are cylindrical surfaces, the outer diameters of the two semicircular rings are identical to the inner diameter of the upper locking sleeve shell, sawteeth are machined on the inner walls of the two semicircular rings, and the inner diameters of the sawteeth gradually increase towards the direction of the middle joint assembly.
Compared with the prior art, the coiled tubing connector provided by the invention has the following technical effects:
1. the pertinence is strong: the connection between the continuous oil pipes with large torque and large axial tension is mainly aimed at deep wells, ultra-deep wells, drilling and the like;
2. the application range is wide: the method can be used for coiled tubing drilling operation, deep well and ultra-deep well coiled tubing operation, well logging, well repair, gas lift oil extraction and other coiled tubing operation with low tension torque requirement;
3. simple structure, convenient operation: the connector can realize rotary connection through the rotary joint of the intermediate joint shell, can realize large torque transmission through the locking of the fixing screw of the rotary joint of the intermediate joint shell, has a simple structure, does not have a complex flow, and is convenient to operate.
Drawings
Other objects and attainments together with a more complete understanding of the invention will become apparent and appreciated by referring to the following description taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic illustration of a semi-section of a coiled tubing connector of the present invention;
FIG. 2 is a schematic cross-sectional view of an upper coiled tubing of the present invention;
FIG. 3 is a schematic cross-sectional view of the upper shackle sealing joint of the present invention;
FIG. 4 is a schematic view of the upper lock sleeve housing of the present invention in semi-section;
FIG. 5 is a schematic view of a semi-sectional construction of a slip cone slip within an upper locking sleeve of the present invention;
FIG. 6 is a schematic diagram of a semi-sectional construction of an upper lock sleeve coiled tubing anti-slip system of the present invention;
FIG. 7 is a schematic illustration of a semi-sectional configuration of an intermediate joint assembly of the present invention.
Wherein reference numerals include: the device comprises a 1-coiled tubing upper locking sleeve assembly, a 2-middle joint assembly, a 3-coiled tubing lower locking sleeve assembly, a 11-upper coiled tubing, a 12-upper locking sleeve sealing joint, a 13-upper locking sleeve shell, a 14-upper locking sleeve external fixation conical slip, a 15-upper locking sleeve sliding conical slip, a 16-upper locking sleeve pre-tightening spring, a 17-upper locking sleeve coiled tubing anti-slip, a 21-middle joint shell rotary joint, a 31-lower coiled tubing, a 32-lower locking sleeve sealing joint, a 33-lower locking sleeve shell, a 34-lower locking sleeve external fixation conical slip, a 35-lower locking sleeve sliding conical slip, a 36-lower locking sleeve pre-tightening spring and a 37-lower locking sleeve coiled tubing anti-slip.
The same reference numerals will be used throughout the drawings to refer to similar or corresponding features or functions.
Detailed Description
The present invention will be described in detail below with reference to the attached drawings.
First, it should be noted that, in the following description, terms "inner circular face", "outer circular face", "left end face", "right end face", "step", "left to right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and should not be construed as limiting the present invention.
Fig. 1 shows a semi-cut structure of a coiled tubing connector according to the present invention.
As shown in fig. 1, the coiled tubing connector of the present invention comprises: the left end of the middle joint assembly 2 is in threaded connection with the coiled tubing upper locking sleeve assembly 1, and the right end of the middle joint assembly 2 is in threaded connection with the coiled tubing lower locking sleeve assembly 3 to jointly form a coiled tubing connector; the coiled tubing upper locking sleeve assembly 1 is used for connecting an upper coiled tubing 11, and the coiled tubing lower locking sleeve assembly 3 is used for connecting a lower coiled tubing 31.
Fig. 2 is a cross-sectional view of the upper coiled tubing of the present invention.
As shown in fig. 2, the upper coiled tubing 11 is composed of an upper coiled tubing body and an upper coiled tubing cutter which are integrally formed, wherein the tail end of the upper coiled tubing cutter is turned outwards and then is bent upwards for a certain distance, and a gap is formed between the bent upper coiled tubing cutter and the upper coiled tubing body.
Since the structure of the upper coiled tubing 11 is the same as that of the lower coiled tubing 31, the structure of the lower coiled tubing 31 is not described again.
As shown in fig. 1, the coiled tubing upper lock sleeve assembly 1 comprises: the upper locking sleeve sealing joint 12, the upper locking sleeve shell 13, the upper locking sleeve external fixing conical slip 14, the upper locking sleeve sliding conical slip 15, the upper locking sleeve pre-tightening spring 16 and the upper locking sleeve coiled tubing anti-slip 17.
The coiled tubing lower lock sleeve assembly 3 comprises: the lower locking sleeve sealing joint 32, the lower locking sleeve shell 33, the lower locking sleeve external fixing conical slips 34, the lower locking sleeve sliding conical slips 35, the lower locking sleeve pre-tightening spring 36 and the lower locking sleeve coiled tubing anti-slip slips 37.
As can be seen intuitively from fig. 1, the coiled tubing upper locking sleeve assembly 1 is coaxial with the coiled tubing lower locking sleeve assembly 3, and the structures of the upper locking sleeve sealing joint 12 and the lower locking sleeve sealing joint 32 are axially symmetrical, that is, the structure of the upper locking sleeve housing 13 is identical to the structure of the lower locking sleeve housing 33, the structure of the upper locking sleeve external fixing conical slips 14 is identical to the structure of the lower locking sleeve external fixing conical slips 34, the structure of the upper locking sleeve sliding conical slips 15 is identical to the structure of the lower locking sleeve sliding conical slips 35, the structure of the upper locking sleeve pre-tightening spring 16 is identical to the structure of the lower locking sleeve pre-tightening spring 36, and the structure of the upper locking sleeve coiled tubing anti-slip slips 17 is identical to the structure of the lower locking sleeve coiled tubing anti-slip slips 37.
The invention takes a coiled tubing upper locking sleeve assembly 1 as an example, and the structures of an upper locking sleeve sealing joint 12, an upper locking sleeve shell 13, an upper locking sleeve external fixing conical slip 14, an upper locking sleeve sliding conical slip 15, an upper locking sleeve pre-tightening spring 16 and an upper locking sleeve coiled tubing anti-slip 17 are described in detail, and the structures of a lower locking sleeve sealing joint 32, a lower locking sleeve shell 33, a lower locking sleeve external fixing conical slip 34, a lower locking sleeve sliding conical slip 35, a lower locking sleeve pre-tightening spring 36 and a lower locking sleeve coiled tubing anti-slip 37 are the same.
Fig. 3 shows a cross-sectional structure of the sealing joint for the upper lock sleeve of the present invention.
As shown in fig. 3, the upper locking sleeve sealing joint 12 is of a cylindrical structure, the outer circular surface of the left end of the cylinder is a conical surface, the outer circular surface of the right end of the cylinder is sequentially provided with a first step, a second step and a third step, the outer diameter of the first step is gradually decreased from left to right, the middle of the cylinder is provided with a first step, the outer diameter is maximum, the maximum outer diameter of the upper locking sleeve sealing joint 12 is obtained by processing external threads on the second step, the third step is provided with three annular sealing grooves for installing an O-ring, and the inner circular surface of the cylinder is provided with six annular sealing grooves for installing the O-ring.
Fig. 3 is a view taken in conjunction with fig. 1, with the upper lock sleeve sealing joint 12 slid over the upper coiled tubing 11.
Fig. 4 shows a half-cut structure of the upper lock sleeve housing of the present invention.
As shown in fig. 4, the main body of the upper lock sleeve housing 13 is a cylindrical structure, the outer diameter of the cylinder is the same as the maximum outer diameter of the upper lock sleeve sealing joint 12, a first step, a second step and a third step are sequentially processed on the inner circular surface of the cylinder from left to right, an internal thread is processed on the first step, the internal thread is matched with an external thread of the second step on the outer circular surface of the upper lock sleeve sealing joint 12, and an internal thread is processed on the third step.
Referring to fig. 4 and 1, the upper locking sleeve outer fixing cone slip 14 is integrally of a cylindrical structure, the outer diameter of the cylinder is the same as the inner diameter of the secondary step of the inner circular surface of the upper locking sleeve housing 13, the inner circular surface of the cylinder is a conical surface with gradually increased inner diameter from left to right, and the left end of the conical surface abuts against the right end surface of the upper locking sleeve sealing joint 12.
FIG. 5 shows a semi-sectional configuration of the sliding cone slips in the upper lock sleeve of the present invention.
As shown in fig. 5, the whole inner sliding cone-shaped slip 15 in the upper locking sleeve is of a cylindrical structure, the inner wall of the structure is a cylindrical surface, the inner diameter of the structure is the same as the outer diameter of the upper continuous oil pipe 11, the inner wall of the inner sliding cone-shaped slip in the upper locking sleeve is processed into a saw-tooth structure with small left and large right and uniform distribution, the outer wall is sequentially processed into a first step, a second step and a third step from left to right, and the first step is a conical surface with the outer wall gradually increasing from left to right; the outer wall of the second-stage step is a cylindrical surface, and a locking sleeve pre-tightening spring 16 is arranged on the second-stage step; the three-stage step increases slightly in outside diameter from left to right.
Referring to fig. 1 and 5, the upper sliding cone slips 15 are placed in the cavity enclosed by the upper coiled tubing 11, the upper locking sleeve sealing joint 12, the upper locking sleeve housing 13 and the middle joint assembly 2, and the right end of the upper sliding cone slips 15 slides into the gap between the bent upper coiled tubing cutting body of the upper coiled tubing 11 and the upper coiled tubing body, and friction is increased to the outer wall of the upper coiled tubing 11 by means of the saw teeth on the inner wall of the upper sliding cone slips 15.
Fig. 6 shows a semi-cut structure of the upper lock sleeve coiled tubing anti-slip of the present invention.
As shown in fig. 6, the upper locking sleeve coiled tubing anti-slip 17 is two semicircular rings, the outer walls of the two semicircular rings are cylindrical surfaces, the outer diameters of the two semicircular rings are the same as the inner diameter of the upper locking sleeve shell 13, the inner walls of the two semicircular rings are saw teeth with gradually increasing inner diameters from left to right, the upper locking sleeve coiled tubing anti-slip 17 is placed in a cavity formed by the upper coiled tubing 11, the upper locking sleeve sealing joint 12, the upper locking sleeve shell 13 and the middle joint assembly 2, and is positioned at the right end of the upper coiled tubing 11, and the upper coiled tubing cutting body of the upper coiled tubing 11 is positioned above the bent surface; the left side of the upper locking sleeve coiled tubing anti-slip 17 is tightly propped by the upper locking sleeve pre-tightening spring 16, and the saw teeth on the inner wall of the upper locking sleeve coiled tubing anti-slip 17 apply pressure to the upper coiled tubing 11, so that larger friction force is provided, and the upper coiled tubing cutting body of the upper coiled tubing 11 is prevented from slipping.
Fig. 7 shows a schematic of the intermediate joint assembly of the present invention in a semi-sectional configuration.
As shown in fig. 7, the intermediate joint assembly 2 includes an intermediate joint core seal screw joint and an intermediate joint housing rotary joint 21, the intermediate joint core seal screw joint being located inside the intermediate joint housing rotary joint 21 and both being screw-connected.
The inner wall of the middle joint housing rotary joint 21 is a cylindrical surface, the inner diameter of the middle joint housing rotary joint 21 is the inner diameter of the continuous oil pipe connector, the middle joint housing rotary joint 21 is coaxial with the upper continuous oil pipe 11, first, second, third, fourth and fifth steps are sequentially processed on the outer wall of the middle joint housing rotary joint 21 from left to right, and the outer diameter of the first step is the same as the inner diameter of the upper continuous oil pipe 11; the outer diameter of the second-stage step is larger than that of the first-stage step, and an external thread matched with an internal thread on the third-stage step of the main body of the upper locking sleeve shell 13 is processed on the second-stage step; the outer diameter of the third-stage step is larger than that of the second-stage step, and is the maximum outer diameter of the continuous oil pipe connector; the outer diameter of the fourth-stage step is the same as that of the second-stage step, and an external thread in threaded connection with the lower locking sleeve shell 33 is processed on the fourth-stage step; the outer diameter of the five-stage step is the same as that of the one-stage step.
Fig. 7 in combination with fig. 1, one end of the intermediate joint housing swivel 21 is slid into the upper coiled tubing 11, the intermediate joint housing swivel being coaxial with the upper coiled tubing.
The above details the specific structure of connecting the coiled tubing upper lock sleeve assembly 1, the middle joint assembly 2 and the coiled tubing lower lock sleeve assembly 3, and the connection flow of connecting the coiled tubing upper lock sleeve assembly 1, the coiled tubing lower lock sleeve assembly 3 and the middle joint assembly 2 will be described below.
The first step: connecting the upper locking sleeve assembly 1 of the continuous oil pipe:
sliding an upper locking sleeve sealing joint 12 on a proper position on an upper continuous oil pipe 11, sliding an upper locking sleeve external fixing conical slip 14 on a proper position on the upper continuous oil pipe 11, sliding a sliding conical slip 15 on the upper locking sleeve on a proper position on the upper continuous oil pipe 11, and installing an upper locking pre-tightening spring 16 on a proper position of the upper continuous oil pipe 11;
bending the upper coiled tubing cutting body at the tail end of the upper coiled tubing 11 outwards, and sliding the right end of the sliding cone slip 15 in the upper locking sleeve into a gap between the upper coiled tubing cutting body at the tail end of the upper coiled tubing 11 and the coiled tubing body;
thirdly, clamping two semicircular rings of the upper locking sleeve coiled tubing anti-slip slips 17 on the outer side of an upper coiled tubing cutting body at the tail end of the upper coiled tubing 11;
fourthly, sliding the left end of the rotary joint 21 of the middle joint shell in the upper continuous oil pipe 11, and screwing the external thread of the second-stage step at the left end of the rotary joint 21 of the middle joint shell with the internal thread of the third-stage step at the inner side of the upper locking sleeve shell 13;
(V) the upper coiled tubing 11, the upper locking sleeve sealing joint 12, the upper locking sleeve external fixing conical slips 14, the upper locking sleeve sliding conical slips 15 and the upper locking pre-tightening spring 16 are sleeved in the upper locking sleeve shell 13 in a sliding mode; the external thread of the second-stage step of the upper locking sleeve sealing joint 12 is screwed with the internal thread of the first-stage step at the inner side of the upper locking sleeve shell 13;
and a second step of: connecting a lower locking sleeve assembly 3 of the continuous oil pipe:
sliding a lower locking sleeve sealing joint 32 on a proper position on a lower continuous oil pipe 31, sliding a lower locking sleeve external fixing conical slip 34 on a proper position on the lower continuous oil pipe 31, sliding a lower locking sleeve sliding conical slip 35 on a proper position on the lower continuous oil pipe 31, and installing a lower locking pre-tightening spring 36 on a proper position of the lower continuous oil pipe 31;
bending the upper coiled tubing cutting body at the tail end of the lower coiled tubing 31 outwards, and sliding the right end of the sliding cone slip 35 in the lower locking sleeve into a gap between the upper coiled tubing cutting body at the tail end of the lower coiled tubing 31 and the coiled tubing body;
thirdly, clamping two semicircular rings of the lower locking sleeve coiled tubing anti-slip slips 37 on the outer side of an upper coiled tubing cutting body at the tail end of the lower coiled tubing 31;
(IV) sliding the right end of the middle joint housing rotary joint 21 in the lower continuous oil pipe 31, and screwing the external thread of the second-stage step at the right end of the middle joint housing rotary joint 21 with the internal thread of the third-stage step at the inner side of the lower locking sleeve housing 33;
(V) sliding the lower coiled tubing 31, the lower locking sleeve sealing joint 32, the lower locking sleeve external fixing conical slips 34, the lower locking sleeve sliding conical slips 35 and the lower locking pre-tightening spring 36 into the proper positions of the lower locking sleeve shell 33; the external thread of the second step of the lower lock sleeve sealing joint 32 is screwed with the internal thread of the first step of the inner side of the lower lock sleeve shell 33, and the installation is completed.
The foregoing is merely illustrative embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present invention, and the invention should be covered. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (7)
1. The coiled tubing connector is characterized by comprising a coiled tubing upper locking sleeve assembly, an intermediate joint assembly and a coiled tubing lower locking sleeve assembly, wherein the structure of the coiled tubing upper locking sleeve assembly is axially symmetrical with the structure of the coiled tubing lower locking sleeve assembly, and the coiled tubing upper locking sleeve assembly and the coiled tubing lower locking sleeve assembly are in threaded connection with two ends of the intermediate joint assembly; wherein,
the coiled tubing upper locking sleeve assembly comprises an upper coiled tubing, an upper locking sleeve sealing joint, an upper locking sleeve shell, an upper locking sleeve external fixed conical slip, an upper sliding conical slip in the upper locking sleeve, an upper locking sleeve pre-tightening spring and an upper locking sleeve coiled tubing anti-slip; the upper coiled tubing comprises an upper coiled tubing body and an upper coiled tubing cutting body which are of an integral structure, wherein the right end of the upper coiled tubing cutting body is bent towards the upper coiled tubing body after being turned outwards, the sealing joint of the upper locking sleeve is sleeved on the upper coiled tubing body in a sliding manner, the two ends of the outer shell of the upper locking sleeve are respectively connected with the sealing joint of the upper locking sleeve and the middle joint assembly in a threaded manner, the sealing joint of the upper locking sleeve, the outer shell of the upper locking sleeve, the middle joint assembly and the upper coiled tubing enclose a cavity, the outer fixed conical slips of the upper locking sleeve, the inner sliding conical slips of the upper locking sleeve, the sliding conical slips of the upper locking sleeve and the sliding conical slips of the upper locking sleeve are respectively positioned in the cavity, the right end of the sliding conical slips of the sliding sleeve is slid into a gap formed between the upper coiled tubing cutting body and the upper coiled tubing body after being bent, the outer fixed conical slips of the upper locking sleeve and the sliding conical slips of the sliding sleeve are respectively positioned in the cavity, and the sliding conical slips of the upper locking sleeve are respectively blocked on the conical slips after the sliding conical slips of the upper locking sleeve and the sliding conical slips of the upper locking sleeve are respectively pushed against the outer side of the coiled tubing;
the middle joint assembly comprises a middle joint core part sealing threaded connector and a middle joint shell rotating connector, wherein the middle joint core part sealing threaded connector is positioned on the inner side of the middle joint shell rotating connector and is in threaded connection with the middle joint shell rotating connector, one end of the middle joint shell rotating connector is sleeved into the upper coiled tubing in a sliding mode, and the middle joint shell rotating connector is coaxial with the upper coiled tubing.
2. The coiled tubing connector of claim 1, wherein the upper locking sleeve sealing joint is of a cylindrical structure, one end, far away from the middle joint assembly, of the outer wall of the upper locking sleeve sealing joint is a conical surface, one end, close to the middle joint assembly, of the upper locking sleeve sealing joint is axially provided with a first step, a second step and a third step, the outer diameter of the first step is the maximum outer diameter of the upper locking sleeve sealing joint, the second step is provided with an external thread, the third step is provided with three annular sealing grooves for installing O-shaped rings, and the inner wall of the upper locking sleeve sealing joint is provided with six annular sealing grooves for installing O-shaped rings.
3. The coiled tubing connector according to claim 2, wherein the upper lock sleeve housing body has a cylindrical structure, the outer diameter of the upper lock sleeve housing body is identical to the maximum outer diameter of the upper lock sleeve sealing joint, the inner wall of the upper lock sleeve housing body is sequentially provided with a first step, a second step and a third step along the axial direction, the inner diameter of the second step is smaller than the inner diameters of the first step and the third step, the first step of the upper lock sleeve housing body is provided with an internal thread matched with an external thread on the second step of the upper lock sleeve sealing joint, and the third step of the upper lock sleeve housing body is provided with an internal thread.
4. A coiled tubing connector according to claim 3, wherein first, second, third, fourth and fifth steps are sequentially machined on the outer wall of the rotary joint of the intermediate joint housing in the axial direction, and the outer diameter of the first step is the same as the inner diameter of the upper coiled tubing; the outer diameter of the second-stage step is larger than that of the first-stage step, and an external thread matched with an internal thread on the third-stage step of the upper locking sleeve shell body is machined on the second-stage step; the outer diameter of the third-stage step is larger than that of the second-stage step, and is the maximum outer diameter of the continuous oil pipe connector; the outer diameter of the four-stage step is the same as that of the two-stage step, and an external thread is machined on the four-stage step; the outer diameter of the five-stage step is the same as that of the one-stage step.
5. The coiled tubing connector of claim 3, wherein the upper locking sleeve external fixation cone slips are of a cylindrical structure, the external diameter of the upper locking sleeve external fixation cone slips is the same as the internal diameter of the secondary step of the upper locking sleeve shell, the inner wall of the upper locking sleeve external fixation cone slips is a conical surface with the internal diameter gradually increasing towards the direction of the middle joint assembly, and one end of the conical surface away from the middle joint assembly is abutted against the end face of the tertiary step of the upper locking sleeve sealing joint.
6. The coiled tubing connector of claim 1, wherein the upper locking sleeve inner sliding cone slips are of a cylindrical structure, the inner diameter of the upper locking sleeve inner sliding cone slips is the same as the outer diameter of the upper coiled tubing, saw teeth which are uniformly distributed towards the direction of the middle joint assembly are processed on the inner wall of the upper locking sleeve inner sliding cone slips, a first step, a second step and a third step are sequentially processed towards the direction of the middle joint assembly on the outer wall of the upper locking sleeve inner sliding cone slips, and the outer wall of the first step is a conical surface with the outer diameter gradually increasing towards the direction of the middle joint assembly; the outer wall of the second-stage step is a cylindrical surface, and the upper locking sleeve pre-tightening spring is placed on the second-stage step; the outer diameter of the three-stage step gradually and gradually increases towards the direction of the middle joint assembly.
7. The coiled tubing connector of claim 3, wherein the upper locking sleeve coiled tubing slip is two semicircular rings, the outer walls of the two semicircular rings are cylindrical surfaces, the outer diameters of the two semicircular rings are the same as the inner diameter of the upper locking sleeve shell, sawteeth are machined on the inner walls of the two semicircular rings, and the inner diameters of the sawteeth gradually increase towards the direction of the middle joint assembly.
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|---|---|---|---|
| CN201811396304.9A CN109138856B (en) | 2018-11-22 | 2018-11-22 | coiled tubing connector |
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| CN201811396304.9A CN109138856B (en) | 2018-11-22 | 2018-11-22 | coiled tubing connector |
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| CN109138856A CN109138856A (en) | 2019-01-04 |
| CN109138856B true CN109138856B (en) | 2023-11-10 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109630038B (en) * | 2019-01-14 | 2023-08-29 | 重庆科技学院 | Equal diameter drilling coiled tubing connector with enlarged outer diameter |
| CN111456645B (en) * | 2019-01-22 | 2022-05-10 | 中国石油天然气股份有限公司 | Continuous oil pipe connector |
| CN113279743B (en) * | 2021-05-25 | 2022-05-31 | 电子科技大学 | Downhole auxiliary measuring device based on flexible composite material |
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